How would I recreate this arched pillar from Vanishing Realms?
Final result:



Modeling:

It's extremely simple.

Just add a Cube. Go to Edit Mode. Select bottom face and extrude (hit E) it down in the Z axis, after extrude - scale it down (hit S). Repeat for every segment.



After that make object Smooth and add Autosmooth or Edgesplit Modifier.